CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities
Net income	$ 42,820	$ 43,094
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	52,291	51,948
Deferred income taxes	19,604	29,000
Amortization of investment tax credits	(469)	(460)
Allowance for equity funds used during construction	(1,379)	(700)
Net derivative losses	95	95
Changes in operating assets and liabilities:
Accounts receivable	(11,303)	1,950
Accrued unbilled revenues	9,496	16,108
Inventories	3,924	(1,209)
Other current assets	6,142	5,697
Accounts payable	(7,307)	(11,844)
Net regulatory assets and liabilities	6,150	(3,386)
Other current liabilities	9,701	(472)
Pension and other employee benefit obligations	(11,002)	(6,973)
Change in other noncurrent assets	(119)	265
Change in other noncurrent liabilities	(500)	(2,155)
Net cash provided by operating activities	118,144	120,958
Investing activities
Utility capital/construction expenditures	(106,553)	(92,687)
Allowance for equity funds used during construction	1,379	700
Other, net	1,096	(52)
Net cash used in investing activities	(104,078)	(92,039)
Financing activities
Proceeds from short-term borrowings, net	33,000	28,000
Proceeds from notes payable to affiliate	50	111,300
Repayments of notes payable to affiliate	0	(148,300)
Repayments of long-term debt	(48)	(44)
Capital contributions from parent	2,162	0
Dividends paid to parent	(49,306)	(24,840)
Net cash used in financing activities	(14,142)	(33,884)
Net change in cash and cash equivalents	(76)	(4,965)
Cash and cash equivalents at beginning of period	1,571	6,445
Cash and cash equivalents at end of period	1,495	1,480
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(16,925)	(17,637)
Cash received for income taxes, net	1,971	1,843
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 8,866	$ 1,323